Evening Steve,
Yes the head unit will work perfectly with Bose, it'll just need coding correctly.
If you've not had it sent to you yet Im happy for you to have it sent to me. Once here Ill gladly trim it down and code it correctly for your A2. You will still require VCDS in your A2 at some point to enable the Nav Page on the DIS Display.
I'll wrap it up very safely and have it back to you using the Royal Mail next days service (as I did for John) which is £32. Extra costs but happy to hell out if you’re not confident enough.
Totally up to you but the trimming down really is a simple task. I can also take you through it over a video call (FaceTime / WhatsApp).
Happy to move to PM if you want me to help out.
Kind regards,
Tom